US20160193441A1 - Anesthetic dispensing device - Google Patents
Anesthetic dispensing device Download PDFInfo
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- US20160193441A1 US20160193441A1 US14/982,500 US201514982500A US2016193441A1 US 20160193441 A1 US20160193441 A1 US 20160193441A1 US 201514982500 A US201514982500 A US 201514982500A US 2016193441 A1 US2016193441 A1 US 2016193441A1
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- Prior art keywords
- anesthetic
- dispensing device
- evaporation chamber
- gas
- accordance
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- 230000003444 anaesthetic effect Effects 0.000 title claims abstract description 157
- 238000001704 evaporation Methods 0.000 claims abstract description 76
- 230000008020 evaporation Effects 0.000 claims abstract description 75
- 239000007789 gas Substances 0.000 claims abstract description 38
- 239000003994 anesthetic gas Substances 0.000 claims abstract description 35
- 239000012159 carrier gas Substances 0.000 claims abstract description 34
- 206010002091 Anaesthesia Diseases 0.000 claims description 28
- 230000037005 anaesthesia Effects 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 19
- 230000006870 function Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims 2
- 230000003247 decreasing effect Effects 0.000 claims 2
- 239000012530 fluid Substances 0.000 claims 2
- 229920006395 saturated elastomer Polymers 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003983 inhalation anesthetic agent Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/104—Preparation of respiratory gases or vapours specially adapted for anaesthetics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/1075—Preparation of respiratory gases or vapours by influencing the temperature
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/021—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes operated by electrical means
- A61M16/022—Control means therefor
- A61M16/024—Control means therefor including calculation means, e.g. using a processor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
- A61M16/18—Vaporising devices for anaesthetic preparations
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/20—Valves specially adapted to medical respiratory devices
- A61M16/201—Controlled valves
- A61M16/202—Controlled valves electrically actuated
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/20—Valves specially adapted to medical respiratory devices
- A61M16/201—Controlled valves
- A61M16/202—Controlled valves electrically actuated
- A61M16/203—Proportional
- A61M16/204—Proportional used for inhalation control
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2202/00—Special media to be introduced, removed or treated
- A61M2202/02—Gases
- A61M2202/0241—Anaesthetics; Analgesics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3334—Measuring or controlling the flow rate
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3365—Rotational speed
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3368—Temperature
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/50—General characteristics of the apparatus with microprocessors or computers
- A61M2205/52—General characteristics of the apparatus with microprocessors or computers with memories providing a history of measured variating parameters of apparatus or patient
Definitions
- the present invention pertains to an anesthetic dispensing device with a carrier gas inlet and with an anesthetic gas outlet, which are connected to one another via a bypass channel and via a dispensing channel arranged parallel hereto in terms of flow.
- An anesthetic-filled evaporation chamber, through which carrier gas flows, is connected to the dispensing channel, such that the carrier gas is enriched with anesthetic and subsequently flows through the dispensing channel to the anesthetic gas outlet.
- the variation of the carrier gas volume flow flowing through the evaporation chamber is carried out by means of a valve element, the valve opening of which can be changed as needed.
- Anesthetic dispensing devices with an evaporation chamber are frequently used in conjunction with anesthesia apparatuses in order to enrich a carrier gas with a volatile anesthetic.
- the anesthetic In the liquid state, the anesthetic is filled into the evaporation chamber, which is usually equipped with a wick device, which becomes saturated with the anesthetic and on its surface finally discharges the evaporating anesthetic liquid to the carrier gas flowing through the evaporation chamber.
- the concentration of the anesthetic in the anesthetic gas fed to the patient must be adapted as a function of the kind of anesthesia as well as the progress of the operation.
- An anesthetic dispensing device of this type with evaporation chamber in which the portion of the gaseous anesthetic in the anesthetic gas can be adjusted in a specific manner, is known from DE 25 07 261 A1.
- the principal portion of the carrier gas stream at first flows in a bypass line past the evaporation chamber.
- a small portion of the carrier gas is fed by a branching of the carrier gas stream into the evaporation chamber, in which it is enriched with the anesthetic until it is saturated and finally flows out of the evaporation chamber via an adjustable dispensing gap.
- the part of the carrier gas stream thus enriched with anesthetic is in turn added to the part of the carrier gas stream, which leaves the bypass channel unchanged, in order to thus generate the anesthetic gas stream needed for the anesthesia of the patient.
- concentration of the anesthetic in the anesthetic gas stream can be adjusted in this connection by means of a variation of the dispensing gap in the dispensing unit, with the portion of the anesthetic in the anesthetic gas being changed by means of changing the dispensing gap width in a specific manner. Via the anesthetic gas outlet, this gas is first fed to an anesthesia apparatus and finally fed to the patient to be treated.
- the dispensing gap described is designed as a ring gap which is formed by a flat surface of a hollow ring body and the flat surface of a hollow cylinder arranged in the hollow ring body. Temperature-related changes in the dispensing gap can be caused by temperature fluctuations in the surrounding area of the anesthetic dispensing device as well as because of the cooling off of the evaporation chamber, which brings about a lowering of the saturation concentration of the anesthetic vapor. To also compensate temperature-related changes in the dispensing gap, a temperature compensation is provided in the anesthetic dispensing device described in DE 25 07 261 A1.
- the hollow cylinder and the hollow ring body are made of different materials, with the hollow cylinder having a smaller coefficient of thermal expansion than the hollow ring body.
- the different coefficients of thermal expansion bring about a path of the flat surface, with which the height of the ring gap is changed.
- the height of the ring gap and thus the free cross section can be changed by providing suitable adjusting screws for adjusting via the ring body.
- an anesthetic dispensing device which has an especially low-friction adjustment of a dispensing cone with respect to a cone sleeve, is known from DE 10 2005 032 154 B3.
- the dispensing cone is fastened in a manner capable of performing strokes with respect to the cone sleeve by means of two membrane elements spaced apart in parallel.
- a movement of the dispensing piston is carried out mechanically either by means of a hand wheel or by means of an electric direct drive.
- a basic object of the present invention is to provide a dispensing unit for the dispensing of an anesthetic in a gas stream, in which an accurate temperature compensation can be implemented with comparatively simple means.
- the temperature compensation shall be achieved in such a way that no further adjusting or calibrating measures are needed during the startup and the operation of a corresponding device.
- the adjustment of the desired anesthetic concentration shall be possible with simple means for the user and shall nevertheless ensure a highly accurate dispensing of anesthetic.
- An anesthetic dispensing device with which the object described above is provided according to the invention.
- the present invention pertains to an anesthetic dispensing device with a carrier gas inlet and with an anesthetic gas outlet, which are connected via a bypass channel and a dispensing channel arranged parallel hereto in terms of flow. Furthermore, an anesthetic-filled evaporation chamber is provided, which enriches gas flowing in with anesthetic, such that carrier gas enriched with anesthetic flows from the evaporation chamber to the anesthetic gas outlet.
- the anesthetic dispensing device has a valve element, the valve opening of which can be changed for variation of a volume flow of the carrier gas to be enriched with anesthetic, flowing through the evaporation chamber.
- An anesthetic dispensing device designed according to the present invention is characterized in that a control unit is provided, by means of which a control signal can be generated for an electric motor drive for adjusting the valve opening of the valve element on the basis of a concentration of the anesthetic in the anesthetic gas needed at the anesthetic gas outlet and at least one temperature-specific correction factor.
- the anesthetic concentration needed thus represents a desired value, which shall be reached by means of suitable adjustment.
- the electric motor drive provided according to the present invention is thus actuated in such a way that the anesthetic concentration needed is adjusted by taking into account a temperature in the area surrounding the anesthesia apparatus and/or a temperature prevailing in the evaporation chamber.
- the valve element is adjusted by the electric motor drive in such a way that the valve opening has the dispensing gap necessary for the flowthrough of the volume flow needed. Because of providing at least one temperature-specific correction factor, it is advantageously possible to take into account especially temperature changes, which are adjusted in the evaporation chamber because of the evaporation of the anesthetic taking place there during the adjustment of the valve opening.
- the electric motor drive is designed as a stepping motor or as a brushed or brushless direct-current motor, and a gear, e.g., in the form of a one-stage or two-stage planet gear, may be provided for reinforcing the torque between the valve element and the electric motor.
- the control unit to be connected to a memory unit, in which at least one characteristic is stored for the determination of the temperature-specific correction factor.
- the temperature-specific correction factor in this case has been formed by taking into account an absolute temperature and/or a temperature change in the surrounding area of the dispensing device and/or in the evaporation chamber. It is especially advantageous in this connection when, in connection with the manufacture of an anesthetic dispensing device designed according to the present invention, corresponding apparatus-specific characteristics are recorded and are stored in the memory unit, to which the control unit can have access during the operation of the anesthetic dispensing device. Corresponding characteristics thus only have to be recorded and stored once and can thus always be used during the ongoing operation, without additional calibration steps being necessary for ensuring a temperature compensation.
- the valve element designed according to the present invention preferably has a dispensing cone arranged in a movable manner, which is mounted in a movable manner with respect to a cone sleeve.
- a ring-shaped dispensing gap which can be changed as needed and which guarantees an accurate dispensing of anesthetic into the carrier gas stream, is provided by means of such a dispensing cone.
- the angular position of the motor shaft in active connection with the dispensing cone is especially monitored.
- Such a motor shaft can selectively be used directly or via the intermediary of a gear with a valve element, especially with a preferably used dispensing cone. According to an advantageous variant of the present invention, it is therefore conceivable that a stepping motor, a linear motor or a gear motor is used as an electric motor drive for moving the dispensing cone.
- a comparatively simple safety concept can be achieved according to another preferred embodiment.
- a monitoring of the angular position of the drive shaft of an electric motor drive is preferably achieved by way of a two-channel monitoring, with two angle sensors or an angle sensor and an incremental sensor being selectively used.
- the actuation of the electric motor drive as well as the analysis of the measured signals, especially the angle measurements, are carried out in a central control unit by means of a microprocessor.
- the desired value of the anesthetic concentration which is input via an input unit directly at the anesthetic dispensing device or an input unit provided at an anesthesia apparatus, is fed as an input variable to the central control unit. If the input unit of an anesthesia apparatus is used, to which the anesthetic dispensing device is fastened at least at times, the desired value is transmitted via a suitable data interface.
- the central control unit of an anesthetic dispensing device designed according to the present invention is either an integral component of this device, which is then connected to an anesthesia apparatus via a suitable interface, or else the control of the anesthetic dispensing is integrated into an anesthesia apparatus, especially in the control unit thereof.
- At least one temperature-specific correction factor is taken into account by the central control unit in each case in the generation of a control signal, such that temperatures changes, especially those that are caused by the evaporation of anesthetic in the evaporation chamber, are taken into account in the electric motor driven adjustment of a dispensing gap.
- a heating element is provided for the heating of the evaporation chamber at least at times.
- a heating device may be designed, e.g., in the form of a heating element integrated into a wick.
- the control signal is preferably generated for adjusting the valve opening, taking a control signal for the heating element into account.
- a control signal may be generated for the heating element taking into account an adjustment of the valve opening and/or of the control signal for adjusting the valve opening.
- This heating element which is additionally provided according to this special embodiment, preferably combined with a coupled actuation of the heating element and the valve element, counteracts a cooling off of the evaporation chamber and in this way supports temperature compensation, such that comparatively high evaporation outputs and the increases in the anesthetic concentration connected therewith can also be achieved. Above all, rapid changes can also take place in a comparatively large area.
- FIG. 1 is schematic view showing a flow path of an anesthetic dispensing device designed according to the present invention with integrated control unit;
- FIG. 2 is a schematic view showing a flow path of an anesthetic dispensing device designed according to the present invention with control unit, which is connected to the anesthesia apparatus via an interface;
- FIG. 3 is a schematic view showing a flow path of an anesthetic dispensing device designed according to the present invention with heatable evaporation chamber and with control unit, which is connected to an anesthesia apparatus via an interface;
- FIG. 4 is a view of the anesthetic dispensing device showing the evaporation chamber with electric motor driven dispensing unit;
- FIG. 5 is an exploded view of the anesthetic dispensing device showing with the electric motor driven dispensing unit;
- FIG. 6 is a schematic partially sectional view of a valve element with cone-shaped adjusting element and cone sleeve valve seat.
- FIG. 1 shows a schematic view with flow diagram of an anesthetic dispensing device 1 designed according to the present invention, which can be fastened to an anesthesia apparatus 10 .
- the anesthetic dispensing device 1 has a central control unit 2 , by means of which the dispensing of anesthetic in a gas stream as needed is ensured.
- the carrier gas especially oxygen-enriched air, flows via a suitable, fluid-tight connection from the anesthesia apparatus 10 into the carrier gas inlet 3 of the anesthetic dispensing device 1 .
- a branch 5 In the area of the carrier gas inlet 3 is located a branch 5 , at which the carrier gas stream is split into two partial gas streams, which flow, on the one hand, into a bypass channel 7 and, on the other hand, into a dispensing channel 8 .
- the part of the carrier gas stream, which flows through the bypass channel 7 reaches a mixing point 6 in the area of the anesthetic gas outlet 4 of the anesthetic dispensing device 1 in an unchanged state.
- the part of the carrier gas stream left unchanged is mixed with the partial gas stream, which has flowed through the dispensing channel 8 and has been enriched with anesthetic in an evaporation chamber 9 , such that a gas mixture, which has the needed anesthetic concentration is provided as anesthetic gas at the anesthetic gas outlet 4 .
- the partial gas stream of the carrier gas which flows into the dispensing channel 8 , is fed to an evaporation chamber 9 , in which liquid anesthetic is stored.
- a wick is provided, which, on the one hand, dips into the liquid anesthetic, and, on the other hand, around which gas to be enriched with anesthetic flows, such that this gas is finally enriched with the necessary quantity of anesthetic.
- a saturation concentration with anesthetic is adjusted within the evaporation chamber in relation to the gas stream flowing through the evaporation chamber 9 .
- the gas saturated with anesthetic flows from the evaporation chamber 9 through the second section of the dispensing channel 8 to the mixing point 6 , where it is mixed with the partial gas stream left unchanged, which has flowed through the bypass channel 7 , such that a gas mixture, which has the needed anesthetic concentration, leaves the anesthetic dispensing device 1 via the anesthetic gas outlet 4 .
- This anesthetic gas flows to the anesthesia apparatus 10 and from here finally to the patient via a suitable patient connecting piece.
- the anesthetic concentration needed is input by the operator, especially an anesthesiologist, via an input unit 11 of the anesthetic dispensing device 1 and made available to the central control unit 2 . Further, a temperature sensor 12 is provided, which detects the temperature in the interior of the evaporation chamber 9 and also transmits the corresponding measured values to the central control unit 2 of the anesthetic dispensing device 1 .
- a control signal is generated by means of a characteristic stored in a memory 13 , with which an electric motor drive 14 can be controlled for adjusting a valve element 15 arranged within the dispensing channel 8 , by means of which valve element 15 the gas stream flowing through the evaporation chamber 9 can be affected.
- the valve element 15 has a cone-shaped adjusting element 30 , which can be moved (in the directions of arrows 40 ) relative to a valve seat designed as a cone sleeve 32 ( FIG. 6 ).
- a ring-shaped dispensing gap 34 which can be changed as needed and which guarantees an accurate dispensing of anesthetic into the carrier gas stream, is provided by means of such a dispensing cone 30 .
- the angular position of the motor shaft 16 in active connection with the dispensing cone is especially monitored.
- Such a motor shaft 16 can selectively be used directly or via the intermediary of a gear or gears 38 connected to the dispensing cone 30 .
- the volume flow or partial gas stream flowing through the dispensing channel 8 and thus through the evaporation chamber 9 can be adjusted as needed in relation to the total volume flow of the carrier gas at the carrier gas inlet 3 by means of the valve element 15 , which is arranged in the dispensing channel 8 , preferably directly behind the evaporation chamber 9 .
- the valve unit 15 is designed in the form of a dispensing cone, which can be moved in relation to a dispensing sleeve and by means of which a dispensing opening in the form of a ring gap is made available because of a specific movement of the cone.
- the dispensing cone is connected to the motor shaft 16 of an electric motor 14 , here of a stepping motor, such that the desired dispensing gap and the necessary valve opening is brought about by means of the motor by a movement of the dispensing cone.
- the control signal in order to bring about a suitable movement of the dispensing cone, is generated by means of the central control unit 2 .
- the control signal is generated by taking into account (as a function of) the desired anesthetic concentration, adjusted via the input unit 11 . Further, the temperature prevailing in the evaporation chamber 9 and detected by the temperature sensor 12 is taken into account in the generation of the control signal (the control signal is also a function of the temperature prevailing in the evaporation chamber 9 ). A temperature compensation value, which is finally used as a basis for generating the control signal, is determined by means of the measured temperature and a characteristic stored in the memory 13 . As soon as the control signal is generated in the manner described above, the dispensing cone provided as the valve element 15 is adjusted and the dispensing gap is adjusted to the desired value.
- the valve gap which is in the form of a ring gap here, is thus adjusted between the dispensing cone and the cone sleeve by means of a specifically actuated electric motor 14 .
- the dispensing elements usually used for adjusting the anesthetic concentration such as the bypass and the dispensing cone as well as the evaporation chamber 9 , are designed as in the prior-art anesthetic dispensing devices.
- a sensor 17 By means of this measure, it is possible to provide a comparatively simple safety concept, in which only the angular position of the drive shaft and of the motor shaft 16 of the electric motor 14 connected rigidly to the dispensing cone have to be monitored by means of a sensor 17 .
- a two-channel monitoring is carried out in this case either with two angle sensors 17 a or an angle sensor 17 a and an incremental sensor 17 b.
- the electric motor 14 used is a stepping motor, which is connected to the drive shaft of the dispensing cone for reinforcing the torque via a gear.
- the actuation of the electric motor 14 as well as the analysis of the angle values detected take place by means of the central control unit 2 , especially by means of a microprocessor 18 , which first receives, as an input variable, the desired value of the necessary anesthetic concentration via the input unit 11 of the anesthetic dispensing device 1 . Further, at least one temperature-specific correction factor and thus temperature-related effects on the valve element 15 are taken into account for generating a control signal for the electric motor 14 .
- FIG. 2 shows another schematic view with flow diagram of an anesthetic dispensing device designed according to the present invention.
- the essential components of the anesthetic dispensing device described in connection with FIG. 2 correspond to the components, which were explained above in connection with FIG. 1 .
- Identical components are identified with identical reference numbers.
- the essential difference between the anesthetic dispensing devices 1 shown in FIG. 2 and in FIG. 1 is that according to FIG. 2 the anesthetic dispensing device 1 itself does not have an input unit, but rather an interface 19 is provided, via which the anesthetic dispensing device 1 is connected to the anesthesia apparatus 10 in terms of data.
- the desired value for the desired concentration of the anesthetic in the anesthetic gas is input via an input unit 20 provided at the anesthesia apparatus 10 and this value is fed as a desired value via the interface 19 of the central control unit 2 of the anesthetic dispensing device 1 .
- a control signal is generated for an electric motor 14 on the basis of (as a function of) this desired value as well as an apparatus-specific temperature compensation value, which was determined on the basis of a characteristic stored in a memory 13 .
- the electric motor 14 actuated in this way, the dispensing cone of a valve element 15 is in turn moved in such a way that the necessary volume flow flows through the evaporation chamber 9 of the anesthetic dispensing device 1 and is finally mixed in the mixing point 6 with the carrier gas stream leaving the bypass channel 7 .
- At least one temperature-specific correction factor and thus temperature-related effects on the valve element 15 are taken into account for generating a control signal for the electric motor 14 connected to the valve element 15 .
- At least one sensor 17 which detects a movement of the motor driven shaft or the valve drive shaft and transmits this value to the central control unit 2 of the anesthetic dispensing device 1 , is in turn provided for monitoring the adjusting operation. In this way, a comparatively simple monitoring of the adjusting operation and thus of the anesthetic dispensing is achieved.
- FIG. 3 shows a schematic view with a flow chart of an anesthetic dispensing device designed according to FIG. 2 , which, however, has a special evaporation chamber 9 .
- the control unit 2 of the anesthetic dispensing device 1 is in turn connected to an anesthesia apparatus 10 via a data interface 19 , such that desired values for the anesthetic concentration can be transmitted via an input unit 20 of the anesthesia device to the control unit 2 of the anesthetic dispensing device.
- the evaporation chamber has a heating element 21 , via which the evaporation in the evaporation chamber 9 can be affected by a specific heat input.
- the heating element 21 is an electrical hot wire, which is integrated into the wick of the evaporation chamber 9 .
- a corresponding control signal is generated for this, and this control signal and the corresponding heat input in the evaporation chamber 9 are taken into account in the generation of a control signal for the electric drive 14 for adjusting the valve element 15 .
- the central control unit 2 present in the anesthetic dispensing device 1 also takes charge of the control of the heating element 21 in the wick, the temperature measured in the evaporation chamber 9 with the temperature sensor 12 can be taken into account in the dispensing of anesthetic.
- This technical design also makes possible the use of a simple bypass gap, which is kept constant in contrast to the conventional anesthetic evaporators, since the effect of temperature-dependent saturation concentration in the evaporation chamber can be compensated by an automatic change in the dispensing gap.
- no additional adjusting valve or butterfly valve which brings about a suitable splitting of the carrier gas stream into corresponding partial gas streams, is necessary.
- FIG. 4 shows in a front view an anesthetic dispensing device 1 designed according to the present invention, which has a valve element 15 driven by means of an electric motor 14 for adjusting the gas stream flowing through the evaporation chamber 9 .
- the essential components of the anesthetic dispensing device 1 are an anesthetic tank 22 , in which liquid anesthetic is stored, a wick, via which liquid anesthetic in an evaporation chamber 9 is fed to a gas stream to be enriched with anesthetic, as well as an electric motor driven valve element 15 , by means of which the volume flow of the gas flowing through the evaporation chamber can be adjusted.
- the electric drive 14 is designed here as a gear motor, i.e., as a combination of an electric motor and a gear which ensures that the drive shaft of the valve element 15 is rotated at a slower speed, but with considerably higher torque than the driven shaft of the motor 14 .
- the gear driven shaft in this case is in active connection with a valve element 15 with a dispensing cone, such that a dispensing gap in the form of a ring gap can be adjusted between the dispensing cone and a cone sleeve in a specific manner.
- the gear motor 14 is actuated by means of a central control unit 2 .
- the central control unit 2 here can be connected via a data interface 19 to the input unit 20 of an anesthesia apparatus 10 .
- the control unit 2 is connected to a memory 13 , in which apparatus-specific characteristics are stored for the compensation of temperature changes in the evaporation chamber 9 .
- a temperature compensation value which together with the desired value for the desired anesthetic concentration is taken into account in the generation of a control signal for the gear motor 14 , is determined by taking into account the recorded characteristic.
- the control signal generated brings about the adjustment of the valve element 15 by means of the gear motor 14 , such that the dispensing gap is adjusted to the desired value and a corresponding volume flow flows through the evaporation chamber 9 .
- the angular position of the driven shaft of the gear motor which corresponds to the drive shaft of the valve element 15 , is detected with a sensor 17 and this value is transmitted to the central control unit 2 .
- the movement of the motor 14 is stopped. Based on this monitoring concept, an accurate adjustment of the valve element 15 and thus of the anesthetic concentration in the anesthetic gas can be ensured in a comparatively simple manner and the corresponding values can also be kept constant over a long time.
- a mechanical stop 27 for the cone is provided as an additional, independent safety element to prevent a blocking state of the cone, in which this [cone] brings the dispensing gap to a stop, and damage of the cone usually connected therewith, in case of an error independently of the angle sensors.
- the mechanical stop can be used to accurately determine the zero position of the cone, i.e., the zero point for the angle measurement, in order to thus increase the accuracy of the angle adjustment. In this way, it is further possible to use incremental sensors which do not determine an absolute angle value.
- FIG. 5 again shows the essential components of an anesthetic dispensing device 1 designed according to the present invention.
- a filling module 23 via which the anesthetic needed in each case can be filled, can be fastened to the anesthetic tank 22 .
- the filling level of the anesthetic can be monitored here via an indicator 24 provided in the front area of the anesthetic dispensing device 1 .
- the so-called bypass cover 25 is fastened in the upper area of the anesthetic tank 22 . In this bypass cover 25 , the carrier gas flows into the dispensing unit 1 in the operating state from the pneumatic module 26 .
- the branch 5 at which the dispensing channel 8 branches in the direction of the evaporation chamber 9 , is located in the bypass cover 25 .
- the mixing point 6 in which the unchanged partial gas stream flowing through the bypass channel 7 as well as the partial gas stream enriched with anesthetic are mixed to form an anesthetic gas, which has the desired anesthetic concentration, is also arranged in the bypass cover 25 .
- the anesthetic gas finally leaves the anesthetic dispensing device 1 in turn via the pneumatic module 26 and flows from here through the anesthesia apparatus 10 , to which the anesthetic dispensing device 1 is fastened, to the patient.
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Abstract
Description
- This application claims the benefit of priority under 35 U.S.C. §119 of
German Patent Application 10 2015 000175.2 filed Jan. 2, 2015, the entire contents of which are incorporated herein by reference. - The present invention pertains to an anesthetic dispensing device with a carrier gas inlet and with an anesthetic gas outlet, which are connected to one another via a bypass channel and via a dispensing channel arranged parallel hereto in terms of flow. An anesthetic-filled evaporation chamber, through which carrier gas flows, is connected to the dispensing channel, such that the carrier gas is enriched with anesthetic and subsequently flows through the dispensing channel to the anesthetic gas outlet. The variation of the carrier gas volume flow flowing through the evaporation chamber is carried out by means of a valve element, the valve opening of which can be changed as needed.
- Anesthetic dispensing devices with an evaporation chamber are frequently used in conjunction with anesthesia apparatuses in order to enrich a carrier gas with a volatile anesthetic. In the liquid state, the anesthetic is filled into the evaporation chamber, which is usually equipped with a wick device, which becomes saturated with the anesthetic and on its surface finally discharges the evaporating anesthetic liquid to the carrier gas flowing through the evaporation chamber. The concentration of the anesthetic in the anesthetic gas fed to the patient must be adapted as a function of the kind of anesthesia as well as the progress of the operation. A hand wheel, by means of which the dispensing unit can be adjusted in a specific manner in the anesthetic evaporator, is provided for this purpose in prior-art anesthetic evaporators.
- An anesthetic dispensing device of this type with evaporation chamber, in which the portion of the gaseous anesthetic in the anesthetic gas can be adjusted in a specific manner, is known from DE 25 07 261 A1. The principal portion of the carrier gas stream at first flows in a bypass line past the evaporation chamber. By contrast, a small portion of the carrier gas is fed by a branching of the carrier gas stream into the evaporation chamber, in which it is enriched with the anesthetic until it is saturated and finally flows out of the evaporation chamber via an adjustable dispensing gap. The part of the carrier gas stream thus enriched with anesthetic is in turn added to the part of the carrier gas stream, which leaves the bypass channel unchanged, in order to thus generate the anesthetic gas stream needed for the anesthesia of the patient. The concentration of the anesthetic in the anesthetic gas stream can be adjusted in this connection by means of a variation of the dispensing gap in the dispensing unit, with the portion of the anesthetic in the anesthetic gas being changed by means of changing the dispensing gap width in a specific manner. Via the anesthetic gas outlet, this gas is first fed to an anesthesia apparatus and finally fed to the patient to be treated.
- The dispensing gap described is designed as a ring gap which is formed by a flat surface of a hollow ring body and the flat surface of a hollow cylinder arranged in the hollow ring body. Temperature-related changes in the dispensing gap can be caused by temperature fluctuations in the surrounding area of the anesthetic dispensing device as well as because of the cooling off of the evaporation chamber, which brings about a lowering of the saturation concentration of the anesthetic vapor. To also compensate temperature-related changes in the dispensing gap, a temperature compensation is provided in the anesthetic dispensing device described in
DE 25 07 261 A1. For this purpose, the hollow cylinder and the hollow ring body are made of different materials, with the hollow cylinder having a smaller coefficient of thermal expansion than the hollow ring body. In case of temperature changes in the evaporation chamber, the different coefficients of thermal expansion bring about a path of the flat surface, with which the height of the ring gap is changed. The height of the ring gap and thus the free cross section can be changed by providing suitable adjusting screws for adjusting via the ring body. - Furthermore, an anesthetic dispensing device, which has an especially low-friction adjustment of a dispensing cone with respect to a cone sleeve, is known from DE 10 2005 032 154 B3. In this case, the dispensing cone is fastened in a manner capable of performing strokes with respect to the cone sleeve by means of two membrane elements spaced apart in parallel. A movement of the dispensing piston is carried out mechanically either by means of a hand wheel or by means of an electric direct drive.
- It is problematic in the solutions known from the state of the art that, on the one hand, that a temperature compensation is accomplished with comparatively complicated measures. In particular, the selection of suitable materials as well as the manufacture and the adjustment of correspondingly accurately adjustable dispensing elements require a considerable technical effort and are economically costly. In order to guarantee a corresponding temperature compensation, it is known to adjust an air stream that flows around the dispensing unit by means of mechanically acting mechanisms in a suitable manner.
- Based on the technical solutions known from the state of the art as well as the problems described above, a basic object of the present invention is to provide a dispensing unit for the dispensing of an anesthetic in a gas stream, in which an accurate temperature compensation can be implemented with comparatively simple means. In particular, the temperature compensation shall be achieved in such a way that no further adjusting or calibrating measures are needed during the startup and the operation of a corresponding device. Furthermore, the adjustment of the desired anesthetic concentration shall be possible with simple means for the user and shall nevertheless ensure a highly accurate dispensing of anesthetic.
- An anesthetic dispensing device, with which the object described above is provided according to the invention. The present invention pertains to an anesthetic dispensing device with a carrier gas inlet and with an anesthetic gas outlet, which are connected via a bypass channel and a dispensing channel arranged parallel hereto in terms of flow. Furthermore, an anesthetic-filled evaporation chamber is provided, which enriches gas flowing in with anesthetic, such that carrier gas enriched with anesthetic flows from the evaporation chamber to the anesthetic gas outlet. Furthermore, the anesthetic dispensing device has a valve element, the valve opening of which can be changed for variation of a volume flow of the carrier gas to be enriched with anesthetic, flowing through the evaporation chamber. An anesthetic dispensing device designed according to the present invention is characterized in that a control unit is provided, by means of which a control signal can be generated for an electric motor drive for adjusting the valve opening of the valve element on the basis of a concentration of the anesthetic in the anesthetic gas needed at the anesthetic gas outlet and at least one temperature-specific correction factor. The anesthetic concentration needed thus represents a desired value, which shall be reached by means of suitable adjustment.
- The electric motor drive provided according to the present invention is thus actuated in such a way that the anesthetic concentration needed is adjusted by taking into account a temperature in the area surrounding the anesthesia apparatus and/or a temperature prevailing in the evaporation chamber. In this case, the valve element is adjusted by the electric motor drive in such a way that the valve opening has the dispensing gap necessary for the flowthrough of the volume flow needed. Because of providing at least one temperature-specific correction factor, it is advantageously possible to take into account especially temperature changes, which are adjusted in the evaporation chamber because of the evaporation of the anesthetic taking place there during the adjustment of the valve opening. The use of an electric motor drive, which is actuated in a suitable manner, thus makes possible an accurate dispensing with temperature compensation that is comparatively simple to achieve at the same time. According to a special variant, the electric motor drive is designed as a stepping motor or as a brushed or brushless direct-current motor, and a gear, e.g., in the form of a one-stage or two-stage planet gear, may be provided for reinforcing the torque between the valve element and the electric motor.
- In a preferred embodiment of the present invention, provisions are made for the control unit to be connected to a memory unit, in which at least one characteristic is stored for the determination of the temperature-specific correction factor. Preferably, the temperature-specific correction factor in this case has been formed by taking into account an absolute temperature and/or a temperature change in the surrounding area of the dispensing device and/or in the evaporation chamber. It is especially advantageous in this connection when, in connection with the manufacture of an anesthetic dispensing device designed according to the present invention, corresponding apparatus-specific characteristics are recorded and are stored in the memory unit, to which the control unit can have access during the operation of the anesthetic dispensing device. Corresponding characteristics thus only have to be recorded and stored once and can thus always be used during the ongoing operation, without additional calibration steps being necessary for ensuring a temperature compensation.
- The valve element designed according to the present invention preferably has a dispensing cone arranged in a movable manner, which is mounted in a movable manner with respect to a cone sleeve. A ring-shaped dispensing gap, which can be changed as needed and which guarantees an accurate dispensing of anesthetic into the carrier gas stream, is provided by means of such a dispensing cone. To implement the necessary adjustment of the dispensing means concentration by means of such a dispensing cone, the angular position of the motor shaft in active connection with the dispensing cone is especially monitored. Such a motor shaft can selectively be used directly or via the intermediary of a gear with a valve element, especially with a preferably used dispensing cone. According to an advantageous variant of the present invention, it is therefore conceivable that a stepping motor, a linear motor or a gear motor is used as an electric motor drive for moving the dispensing cone.
- A comparatively simple safety concept can be achieved according to another preferred embodiment. A monitoring of the angular position of the drive shaft of an electric motor drive is preferably achieved by way of a two-channel monitoring, with two angle sensors or an angle sensor and an incremental sensor being selectively used.
- According to the present invention, the actuation of the electric motor drive as well as the analysis of the measured signals, especially the angle measurements, are carried out in a central control unit by means of a microprocessor. For this purpose, the desired value of the anesthetic concentration, which is input via an input unit directly at the anesthetic dispensing device or an input unit provided at an anesthesia apparatus, is fed as an input variable to the central control unit. If the input unit of an anesthesia apparatus is used, to which the anesthetic dispensing device is fastened at least at times, the desired value is transmitted via a suitable data interface.
- The central control unit of an anesthetic dispensing device designed according to the present invention is either an integral component of this device, which is then connected to an anesthesia apparatus via a suitable interface, or else the control of the anesthetic dispensing is integrated into an anesthesia apparatus, especially in the control unit thereof.
- At least one temperature-specific correction factor is taken into account by the central control unit in each case in the generation of a control signal, such that temperatures changes, especially those that are caused by the evaporation of anesthetic in the evaporation chamber, are taken into account in the electric motor driven adjustment of a dispensing gap.
- According to another embodiment of the present invention, a heating element is provided for the heating of the evaporation chamber at least at times. Such a heating device may be designed, e.g., in the form of a heating element integrated into a wick. In this case, the control signal is preferably generated for adjusting the valve opening, taking a control signal for the heating element into account. As an alternative or in addition a control signal may be generated for the heating element taking into account an adjustment of the valve opening and/or of the control signal for adjusting the valve opening. In this case also, it is, in contrast to conventional anesthetic evaporators, possible to carry out the splitting of the carrier gas stream into a partial gas stream flowing through the bypass channel and a partial gas stream flowing through the dispensing channel exclusively by means of a specific adjustment of the dispensing gap, i.e., especially without having to adjust the bypass gap indirectly or directly as a function of a change in temperature. This can, above all, be attributed to the fact that the influence of the temperature-dependent saturation concentration in the evaporation chamber can be compensated by an automatic change in the dispensing gap. This heating element, which is additionally provided according to this special embodiment, preferably combined with a coupled actuation of the heating element and the valve element, counteracts a cooling off of the evaporation chamber and in this way supports temperature compensation, such that comparatively high evaporation outputs and the increases in the anesthetic concentration connected therewith can also be achieved. Above all, rapid changes can also take place in a comparatively large area.
- The present invention is explained in detail below based on special embodiments without limiting the general idea of the present invention on the basis of the figures. The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated.
- In the drawings:
-
FIG. 1 is schematic view showing a flow path of an anesthetic dispensing device designed according to the present invention with integrated control unit; -
FIG. 2 is a schematic view showing a flow path of an anesthetic dispensing device designed according to the present invention with control unit, which is connected to the anesthesia apparatus via an interface; -
FIG. 3 is a schematic view showing a flow path of an anesthetic dispensing device designed according to the present invention with heatable evaporation chamber and with control unit, which is connected to an anesthesia apparatus via an interface; -
FIG. 4 is a view of the anesthetic dispensing device showing the evaporation chamber with electric motor driven dispensing unit; -
FIG. 5 is an exploded view of the anesthetic dispensing device showing with the electric motor driven dispensing unit; and -
FIG. 6 is a schematic partially sectional view of a valve element with cone-shaped adjusting element and cone sleeve valve seat. - Referring to the drawings,
FIG. 1 shows a schematic view with flow diagram of ananesthetic dispensing device 1 designed according to the present invention, which can be fastened to ananesthesia apparatus 10. Theanesthetic dispensing device 1 has acentral control unit 2, by means of which the dispensing of anesthetic in a gas stream as needed is ensured. A data link between theanesthetic dispensing device 1 withintegrated control unit 2, on the one hand, and theanesthesia apparatus 10, on the other hand, is not shown. - The carrier gas, especially oxygen-enriched air, flows via a suitable, fluid-tight connection from the
anesthesia apparatus 10 into thecarrier gas inlet 3 of theanesthetic dispensing device 1. In the area of thecarrier gas inlet 3 is located abranch 5, at which the carrier gas stream is split into two partial gas streams, which flow, on the one hand, into abypass channel 7 and, on the other hand, into a dispensingchannel 8. The part of the carrier gas stream, which flows through thebypass channel 7, reaches amixing point 6 in the area of theanesthetic gas outlet 4 of theanesthetic dispensing device 1 in an unchanged state. At thismixing point 6, the part of the carrier gas stream left unchanged is mixed with the partial gas stream, which has flowed through the dispensingchannel 8 and has been enriched with anesthetic in anevaporation chamber 9, such that a gas mixture, which has the needed anesthetic concentration is provided as anesthetic gas at theanesthetic gas outlet 4. - The partial gas stream of the carrier gas, which flows into the dispensing
channel 8, is fed to anevaporation chamber 9, in which liquid anesthetic is stored. In the evaporation chamber a wick is provided, which, on the one hand, dips into the liquid anesthetic, and, on the other hand, around which gas to be enriched with anesthetic flows, such that this gas is finally enriched with the necessary quantity of anesthetic. A saturation concentration with anesthetic is adjusted within the evaporation chamber in relation to the gas stream flowing through theevaporation chamber 9. The gas saturated with anesthetic flows from theevaporation chamber 9 through the second section of the dispensingchannel 8 to themixing point 6, where it is mixed with the partial gas stream left unchanged, which has flowed through thebypass channel 7, such that a gas mixture, which has the needed anesthetic concentration, leaves theanesthetic dispensing device 1 via theanesthetic gas outlet 4. This anesthetic gas flows to theanesthesia apparatus 10 and from here finally to the patient via a suitable patient connecting piece. - The anesthetic concentration needed is input by the operator, especially an anesthesiologist, via an
input unit 11 of theanesthetic dispensing device 1 and made available to thecentral control unit 2. Further, atemperature sensor 12 is provided, which detects the temperature in the interior of theevaporation chamber 9 and also transmits the corresponding measured values to thecentral control unit 2 of theanesthetic dispensing device 1. Taking into account the desired concentration of the anesthetic as well as the temperature prevailing in theevaporation chamber 9, a control signal is generated by means of a characteristic stored in amemory 13, with which anelectric motor drive 14 can be controlled for adjusting avalve element 15 arranged within the dispensingchannel 8, by means of whichvalve element 15 the gas stream flowing through theevaporation chamber 9 can be affected. Thevalve element 15 has a cone-shaped adjusting element 30, which can be moved (in the directions of arrows 40) relative to a valve seat designed as a cone sleeve 32 (FIG. 6 ). A ring-shapeddispensing gap 34, which can be changed as needed and which guarantees an accurate dispensing of anesthetic into the carrier gas stream, is provided by means of such a dispensing cone 30. To implement the necessary adjustment of the dispensing means concentration, by means of such a dispensing cone 30, the angular position of themotor shaft 16 in active connection with the dispensing cone is especially monitored. Such amotor shaft 16 can selectively be used directly or via the intermediary of a gear or gears 38 connected to the dispensing cone 30. - The volume flow or partial gas stream flowing through the dispensing
channel 8 and thus through theevaporation chamber 9 can be adjusted as needed in relation to the total volume flow of the carrier gas at thecarrier gas inlet 3 by means of thevalve element 15, which is arranged in the dispensingchannel 8, preferably directly behind theevaporation chamber 9. - The
valve unit 15 is designed in the form of a dispensing cone, which can be moved in relation to a dispensing sleeve and by means of which a dispensing opening in the form of a ring gap is made available because of a specific movement of the cone. The dispensing cone is connected to themotor shaft 16 of anelectric motor 14, here of a stepping motor, such that the desired dispensing gap and the necessary valve opening is brought about by means of the motor by a movement of the dispensing cone. The control signal, in order to bring about a suitable movement of the dispensing cone, is generated by means of thecentral control unit 2. In this case, the control signal is generated by taking into account (as a function of) the desired anesthetic concentration, adjusted via theinput unit 11. Further, the temperature prevailing in theevaporation chamber 9 and detected by thetemperature sensor 12 is taken into account in the generation of the control signal (the control signal is also a function of the temperature prevailing in the evaporation chamber 9). A temperature compensation value, which is finally used as a basis for generating the control signal, is determined by means of the measured temperature and a characteristic stored in thememory 13. As soon as the control signal is generated in the manner described above, the dispensing cone provided as thevalve element 15 is adjusted and the dispensing gap is adjusted to the desired value. - According to the present invention, the valve gap, which is in the form of a ring gap here, is thus adjusted between the dispensing cone and the cone sleeve by means of a specifically actuated
electric motor 14. In this case, the dispensing elements usually used for adjusting the anesthetic concentration, such as the bypass and the dispensing cone as well as theevaporation chamber 9, are designed as in the prior-art anesthetic dispensing devices. By means of this measure, it is possible to provide a comparatively simple safety concept, in which only the angular position of the drive shaft and of themotor shaft 16 of theelectric motor 14 connected rigidly to the dispensing cone have to be monitored by means of asensor 17. A two-channel monitoring is carried out in this case either with twoangle sensors 17 a or anangle sensor 17 a and anincremental sensor 17 b. - The
electric motor 14 used is a stepping motor, which is connected to the drive shaft of the dispensing cone for reinforcing the torque via a gear. The actuation of theelectric motor 14 as well as the analysis of the angle values detected take place by means of thecentral control unit 2, especially by means of amicroprocessor 18, which first receives, as an input variable, the desired value of the necessary anesthetic concentration via theinput unit 11 of theanesthetic dispensing device 1. Further, at least one temperature-specific correction factor and thus temperature-related effects on thevalve element 15 are taken into account for generating a control signal for theelectric motor 14. -
FIG. 2 shows another schematic view with flow diagram of an anesthetic dispensing device designed according to the present invention. The essential components of the anesthetic dispensing device described in connection withFIG. 2 correspond to the components, which were explained above in connection withFIG. 1 . Identical components are identified with identical reference numbers. - The essential difference between the
anesthetic dispensing devices 1 shown inFIG. 2 and inFIG. 1 is that according toFIG. 2 theanesthetic dispensing device 1 itself does not have an input unit, but rather aninterface 19 is provided, via which theanesthetic dispensing device 1 is connected to theanesthesia apparatus 10 in terms of data. In this case, the desired value for the desired concentration of the anesthetic in the anesthetic gas is input via aninput unit 20 provided at theanesthesia apparatus 10 and this value is fed as a desired value via theinterface 19 of thecentral control unit 2 of theanesthetic dispensing device 1. In thecentral control unit 2 of theanesthetic dispensing device 1, a control signal is generated for anelectric motor 14 on the basis of (as a function of) this desired value as well as an apparatus-specific temperature compensation value, which was determined on the basis of a characteristic stored in amemory 13. By means of theelectric motor 14 actuated in this way, the dispensing cone of avalve element 15 is in turn moved in such a way that the necessary volume flow flows through theevaporation chamber 9 of theanesthetic dispensing device 1 and is finally mixed in themixing point 6 with the carrier gas stream leaving thebypass channel 7. It is essential in turn that at least one temperature-specific correction factor and thus temperature-related effects on thevalve element 15 are taken into account for generating a control signal for theelectric motor 14 connected to thevalve element 15. At least onesensor 17, which detects a movement of the motor driven shaft or the valve drive shaft and transmits this value to thecentral control unit 2 of theanesthetic dispensing device 1, is in turn provided for monitoring the adjusting operation. In this way, a comparatively simple monitoring of the adjusting operation and thus of the anesthetic dispensing is achieved. -
FIG. 3 shows a schematic view with a flow chart of an anesthetic dispensing device designed according toFIG. 2 , which, however, has aspecial evaporation chamber 9. Thecontrol unit 2 of theanesthetic dispensing device 1 is in turn connected to ananesthesia apparatus 10 via adata interface 19, such that desired values for the anesthetic concentration can be transmitted via aninput unit 20 of the anesthesia device to thecontrol unit 2 of the anesthetic dispensing device. - In the exemplary embodiment shown in
FIG. 3 , the evaporation chamber has aheating element 21, via which the evaporation in theevaporation chamber 9 can be affected by a specific heat input. Theheating element 21 is an electrical hot wire, which is integrated into the wick of theevaporation chamber 9. In thecentral control unit 2 of theanesthetic dispensing device 1, a corresponding control signal is generated for this, and this control signal and the corresponding heat input in theevaporation chamber 9 are taken into account in the generation of a control signal for theelectric drive 14 for adjusting thevalve element 15. - Since the
central control unit 2 present in theanesthetic dispensing device 1 also takes charge of the control of theheating element 21 in the wick, the temperature measured in theevaporation chamber 9 with thetemperature sensor 12 can be taken into account in the dispensing of anesthetic. This technical design also makes possible the use of a simple bypass gap, which is kept constant in contrast to the conventional anesthetic evaporators, since the effect of temperature-dependent saturation concentration in the evaporation chamber can be compensated by an automatic change in the dispensing gap. Thus, no additional adjusting valve or butterfly valve, which brings about a suitable splitting of the carrier gas stream into corresponding partial gas streams, is necessary. -
FIG. 4 shows in a front view ananesthetic dispensing device 1 designed according to the present invention, which has avalve element 15 driven by means of anelectric motor 14 for adjusting the gas stream flowing through theevaporation chamber 9. The essential components of theanesthetic dispensing device 1 are ananesthetic tank 22, in which liquid anesthetic is stored, a wick, via which liquid anesthetic in anevaporation chamber 9 is fed to a gas stream to be enriched with anesthetic, as well as an electric motor drivenvalve element 15, by means of which the volume flow of the gas flowing through the evaporation chamber can be adjusted. Theelectric drive 14 is designed here as a gear motor, i.e., as a combination of an electric motor and a gear which ensures that the drive shaft of thevalve element 15 is rotated at a slower speed, but with considerably higher torque than the driven shaft of themotor 14. The gear driven shaft in this case is in active connection with avalve element 15 with a dispensing cone, such that a dispensing gap in the form of a ring gap can be adjusted between the dispensing cone and a cone sleeve in a specific manner. Thegear motor 14 is actuated by means of acentral control unit 2. Thecentral control unit 2 here can be connected via adata interface 19 to theinput unit 20 of ananesthesia apparatus 10. Via this input unit, it is possible for an operator, especially an anesthesiologist, to adjust a value for the anesthetic concentration needed in each case, which is then made available as a desired value to thecontrol unit 2 of theanesthetic dispensing device 1. - The
control unit 2 is connected to amemory 13, in which apparatus-specific characteristics are stored for the compensation of temperature changes in theevaporation chamber 9. Depending on the temperature in theevaporation chamber 9 of theanesthetic dispensing device 1, which is detected by means of asuitable temperature sensor 12, a temperature compensation value, which together with the desired value for the desired anesthetic concentration is taken into account in the generation of a control signal for thegear motor 14, is determined by taking into account the recorded characteristic. Finally, the control signal generated brings about the adjustment of thevalve element 15 by means of thegear motor 14, such that the dispensing gap is adjusted to the desired value and a corresponding volume flow flows through theevaporation chamber 9. The angular position of the driven shaft of the gear motor, which corresponds to the drive shaft of thevalve element 15, is detected with asensor 17 and this value is transmitted to thecentral control unit 2. As soon as the angular position of the driven shaft corresponds to the desired opening of the dispensing gap, the movement of themotor 14 is stopped. Based on this monitoring concept, an accurate adjustment of thevalve element 15 and thus of the anesthetic concentration in the anesthetic gas can be ensured in a comparatively simple manner and the corresponding values can also be kept constant over a long time. - Further, a
mechanical stop 27 for the cone is provided as an additional, independent safety element to prevent a blocking state of the cone, in which this [cone] brings the dispensing gap to a stop, and damage of the cone usually connected therewith, in case of an error independently of the angle sensors. Furthermore, the mechanical stop can be used to accurately determine the zero position of the cone, i.e., the zero point for the angle measurement, in order to thus increase the accuracy of the angle adjustment. In this way, it is further possible to use incremental sensors which do not determine an absolute angle value. -
FIG. 5 again shows the essential components of ananesthetic dispensing device 1 designed according to the present invention. A fillingmodule 23, via which the anesthetic needed in each case can be filled, can be fastened to theanesthetic tank 22. The filling level of the anesthetic can be monitored here via anindicator 24 provided in the front area of theanesthetic dispensing device 1. The so-calledbypass cover 25 is fastened in the upper area of theanesthetic tank 22. In thisbypass cover 25, the carrier gas flows into the dispensingunit 1 in the operating state from thepneumatic module 26. Thebranch 5, at which the dispensingchannel 8 branches in the direction of theevaporation chamber 9, is located in thebypass cover 25. Themixing point 6, in which the unchanged partial gas stream flowing through thebypass channel 7 as well as the partial gas stream enriched with anesthetic are mixed to form an anesthetic gas, which has the desired anesthetic concentration, is also arranged in thebypass cover 25. The anesthetic gas finally leaves theanesthetic dispensing device 1 in turn via thepneumatic module 26 and flows from here through theanesthesia apparatus 10, to which theanesthetic dispensing device 1 is fastened, to the patient. - While specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.
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CN114931687A (en) * | 2022-05-19 | 2022-08-23 | 四川大学华西医院 | Concentration adjustable anesthesia device for anesthesia department |
CN117224801A (en) * | 2023-11-15 | 2023-12-15 | 吉林大学 | Flow sensing and measuring device in anesthesia machine |
Also Published As
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FR3031314A1 (en) | 2016-07-08 |
FR3031314B1 (en) | 2021-11-05 |
CN105749400B (en) | 2019-10-18 |
DE102015000175B3 (en) | 2016-07-07 |
US10682485B2 (en) | 2020-06-16 |
CN105749400A (en) | 2016-07-13 |
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